stanza xviii.
The ancients believed that foals were born with a lump on their foreheads.

The name given to this was _hippomanes_, and it was supposed to act as a powerful love-philtre.
LXXXII.

By the 'unknown Avenger' Virgil clearly points to Hannibal.
NOTES TO BOOK FIVE IV.

Eryx was the son of Venus and Butes, Aeneas son of Venus and Anchises, hence they are called brothers here.

Eryx is the legendary founder of the town of that name on the west coast of Sicily, near Mount Eryx.
VI.